61551015155 has 32 divisors (see below), whose sum is σ = 85934753280. Its totient is φ = 41446967040.

The previous prime is 61551015073. The next prime is 61551015179. The reversal of 61551015155 is 55151015516.

It is not a de Polignac number, because 61551015155 - 2¹² = 61551011059 is a prime.

It is a super-2 number, since 2×61551015155² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1989767 + ... + 2020463.

It is an arithmetic number, because the mean of its divisors is an integer number (2685461040).

Almost surely, 2^61551015155 is an apocalyptic number.

61551015155 is a deficient number, since it is larger than the sum of its proper divisors (24383738125).

61551015155 is a wasteful number, since it uses less digits than its factorization.

61551015155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31739.

The product of its (nonzero) digits is 18750, while the sum is 35.

The spelling of 61551015155 in words is "sixty-one billion, five hundred fifty-one million, fifteen thousand, one hundred fifty-five".