55770521 has 4 divisors (see below), whose sum is σ = 55939344. Its totient is φ = 55601700.

The previous prime is 55770497. The next prime is 55770563. The reversal of 55770521 is 12507755.

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 not a de Polignac number, because 55770521 - 2¹⁸ = 55508377 is a prime.

It is a super-2 number, since 2×55770521² = 6220702025222882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55770821) 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, 83915 + ... + 84576.

It is an arithmetic number, because the mean of its divisors is an integer number (13984836).

Almost surely, 2^55770521 is an apocalyptic number.

It is an amenable number.

55770521 is a deficient number, since it is larger than the sum of its proper divisors (168823).

55770521 is a wasteful number, since it uses less digits than its factorization.

55770521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168822.

The product of its (nonzero) digits is 12250, while the sum is 32.

The square root of 55770521 is about 7467.9663229021. The cubic root of 55770521 is about 382.0629287884.

The spelling of 55770521 in words is "fifty-five million, seven hundred seventy thousand, five hundred twenty-one".