1057077561521 has 4 divisors (see below), whose sum is σ = 1057115123952. Its totient is φ = 1057039999092.

The previous prime is 1057077561511. The next prime is 1057077561557. The reversal of 1057077561521 is 1251657707501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1057077561521 is a prime.

It is a super-2 number, since 2×1057077561521² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1057077561511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18738971 + ... + 18795296.

It is an arithmetic number, because the mean of its divisors is an integer number (264278780988).

Almost surely, 2^{1057077561521} is an apocalyptic number.

It is an amenable number.

1057077561521 is a deficient number, since it is larger than the sum of its proper divisors (37562431).

1057077561521 is an equidigital number, since it uses as much as digits as its factorization.

1057077561521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37562430.

The product of its (nonzero) digits is 514500, while the sum is 47.

The spelling of 1057077561521 in words is "one trillion, fifty-seven billion, seventy-seven million, five hundred sixty-one thousand, five hundred twenty-one".