61555551006 has 32 divisors (see below), whose sum is σ = 126966140928. Its totient is φ = 19883525760.

The previous prime is 61555550983. The next prime is 61555551007. The reversal of 61555551006 is 60015555516.

It is a super-2 number, since 2×61555551006² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61555551007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 906555 + ... + 972086.

It is an arithmetic number, because the mean of its divisors is an integer number (3967691904).

Almost surely, 2^61555551006 is an apocalyptic number.

61555551006 is an abundant number, since it is smaller than the sum of its proper divisors (65410589922).

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

61555551006 is a wasteful number, since it uses less digits than its factorization.

61555551006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878816.

The product of its (nonzero) digits is 112500, while the sum is 39.

The spelling of 61555551006 in words is "sixty-one billion, five hundred fifty-five million, five hundred fifty-one thousand, six".