75140447752881 has 45 divisors (see below), whose sum is σ = 130573805662971. Its totient is φ = 42937086655008.

The previous prime is 75140447752831. The next prime is 75140447752907. The reversal of 75140447752881 is 18825774404157.

It is a happy number.

The square root of 75140447752881 is 8668359.

It is a perfect power (a square), and thus also a powerful number.

75140447752881 is a `hidden beast` number, since 7 + 5 + 1 + 40 + 447 + 75 + 2 + 8 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 48212817167025 + 26927630585856 = 6943545^2 + 5189184^2 .

It is not a de Polignac number, because 75140447752881 - 2¹¹ = 75140447750833 is a prime.

It is a super-2 number, since 2×75140447752881² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (75140447752831) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 546037821 + ... + 546175413.

Almost surely, 2^{75140447752881} is an apocalyptic number.

75140447752881 is the 8668359-th square number.

75140447752881 is the 4334180-th centered octagonal number.

It is an amenable number.

75140447752881 is a deficient number, since it is larger than the sum of its proper divisors (55433357910090).

75140447752881 is an frugal number, since it uses more digits than its factorization.

75140447752881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275212 (or 137603 counting only the distinct ones).

The product of its (nonzero) digits is 70246400, while the sum is 63.

The spelling of 75140447752881 in words is "seventy-five trillion, one hundred forty billion, four hundred forty-seven million, seven hundred fifty-two thousand, eight hundred eighty-one".