61251541553 has 8 divisors (see below), whose sum is σ = 62910185448. Its totient is φ = 59593065984.

The previous prime is 61251541543. The next prime is 61251541573. The reversal of 61251541553 is 35514515216.

It can be written as a sum of positive squares in 4 ways, for example, as 32792863744 + 28458677809 = 181088^2 + 168697^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61251541553 - 2¹⁴ = 61251525169 is a prime.

It is a super-4 number, since 4×61251541553⁴ (a number of 44 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61251541513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1135175 + ... + 1187907.

It is an arithmetic number, because the mean of its divisors is an integer number (7863773181).

Almost surely, 2^61251541553 is an apocalyptic number.

It is an amenable number.

61251541553 is a deficient number, since it is larger than the sum of its proper divisors (1658643895).

61251541553 is a wasteful number, since it uses less digits than its factorization.

61251541553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84163.

The product of its digits is 90000, while the sum is 38.

The spelling of 61251541553 in words is "sixty-one billion, two hundred fifty-one million, five hundred forty-one thousand, five hundred fifty-three".