61043615257 has 8 divisors (see below), whose sum is σ = 61461808200. Its totient is φ = 60625536000.

The previous prime is 61043615251. The next prime is 61043615287. The reversal of 61043615257 is 75251634016.

It can be written as a sum of positive squares in 4 ways, for example, as 206899456 + 60836715801 = 14384^2 + 246651^2 .

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-61043615257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61043615251) 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, 1242553 + ... + 1290745.

It is an arithmetic number, because the mean of its divisors is an integer number (7682726025).

Almost surely, 2^61043615257 is an apocalyptic number.

It is an amenable number.

61043615257 is a deficient number, since it is larger than the sum of its proper divisors (418192943).

61043615257 is a wasteful number, since it uses less digits than its factorization.

61043615257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56843.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 61043615257 in words is "sixty-one billion, forty-three million, six hundred fifteen thousand, two hundred fifty-seven".