61555601001 has 16 divisors (see below), whose sum is σ = 83099278080. Its totient is φ = 40524928080.

The previous prime is 61555600937. The next prime is 61555601027. The reversal of 61555601001 is 10010655516.

It is not a de Polignac number, because 61555601001 - 2⁶ = 61555600937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61555601001.

It is not an unprimeable number, because it can be changed into a prime (61555601071) 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, 529566 + ... + 635256.

It is an arithmetic number, because the mean of its divisors is an integer number (5193704880).

Almost surely, 2^61555601001 is an apocalyptic number.

It is an amenable number.

61555601001 is a deficient number, since it is larger than the sum of its proper divisors (21543677079).

61555601001 is a wasteful number, since it uses less digits than its factorization.

61555601001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108116.

The product of its (nonzero) digits is 4500, while the sum is 30.

The spelling of 61555601001 in words is "sixty-one billion, five hundred fifty-five million, six hundred one thousand, one".