75121761660 has 48 divisors (see below), whose sum is σ = 229462837632. Its totient is φ = 18211336000.

The previous prime is 75121761599. The next prime is 75121761661. The reversal of 75121761660 is 6616712157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75121761661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56909766 + ... + 56911085.

It is an arithmetic number, because the mean of its divisors is an integer number (4780475784).

Almost surely, 2^75121761660 is an apocalyptic number.

It is an amenable number.

75121761660 is an abundant number, since it is smaller than the sum of its proper divisors (154341075972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

75121761660 is a wasteful number, since it uses less digits than its factorization.

75121761660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113820874 (or 113820872 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 42.

The spelling of 75121761660 in words is "seventy-five billion, one hundred twenty-one million, seven hundred sixty-one thousand, six hundred sixty".