55660331 has 4 divisors (see below), whose sum is σ = 55850592. Its totient is φ = 55470072.

The previous prime is 55660307. The next prime is 55660337. The reversal of 55660331 is 13306655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13306655 = 5 ⋅2661331.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55660331 is a prime.

It is a super-2 number, since 2×55660331² = 6196144894059122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55660294 and 55660303.

It is not an unprimeable number, because it can be changed into a prime (55660337) 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, 94691 + ... + 95276.

It is an arithmetic number, because the mean of its divisors is an integer number (13962648).

Almost surely, 2^55660331 is an apocalyptic number.

55660331 is a deficient number, since it is larger than the sum of its proper divisors (190261).

55660331 is a wasteful number, since it uses less digits than its factorization.

55660331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190260.

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 55660331 is about 7460.5851647173. The cubic root of 55660331 is about 381.8111394307.

Adding to 55660331 its reverse (13306655), we get a palindrome (68966986).

The spelling of 55660331 in words is "fifty-five million, six hundred sixty thousand, three hundred thirty-one".