61026757255657 has 8 divisors (see below), whose sum is σ = 64420671152160. Its totient is φ = 57651041289600.

The previous prime is 61026757255589. The next prime is 61026757255817. The reversal of 61026757255657 is 75655275762016.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61026757255657 is a prime.

It is a super-2 number, since 2×61026757255657² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61026757285657) 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, 4549475719 + ... + 4549489132.

It is an arithmetic number, because the mean of its divisors is an integer number (8052583894020).

Almost surely, 2^{61026757255657} is an apocalyptic number.

It is an amenable number.

61026757255657 is a deficient number, since it is larger than the sum of its proper divisors (3393913896503).

61026757255657 is a wasteful number, since it uses less digits than its factorization.

61026757255657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9098965223.

The product of its (nonzero) digits is 185220000, while the sum is 64.

The spelling of 61026757255657 in words is "sixty-one trillion, twenty-six billion, seven hundred fifty-seven million, two hundred fifty-five thousand, six hundred fifty-seven".