55571617477506 has 64 divisors (see below), whose sum is σ = 120084418581120. Its totient is φ = 17043009984000.

The previous prime is 55571617477501. The next prime is 55571617477511. The reversal of 55571617477506 is 60577471617555.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55571617477501) and next prime (55571617477511).

It is not an unprimeable number, because it can be changed into a prime (55571617477501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 342422881 + ... + 342585131.

It is an arithmetic number, because the mean of its divisors is an integer number (1876319040330).

Almost surely, 2^{55571617477506} is an apocalyptic number.

55571617477506 is an abundant number, since it is smaller than the sum of its proper divisors (64512801103614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55571617477506 is a wasteful number, since it uses less digits than its factorization.

55571617477506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176611.

The product of its (nonzero) digits is 216090000, while the sum is 66.

The spelling of 55571617477506 in words is "fifty-five trillion, five hundred seventy-one billion, six hundred seventeen million, four hundred seventy-seven thousand, five hundred six".