61553696271 has 16 divisors (see below), whose sum is σ = 86936467968. Its totient is φ = 38605424000.

The previous prime is 61553696219. The next prime is 61553696273. The reversal of 61553696271 is 17269635516.

It is a cyclic number.

It is not a de Polignac number, because 61553696271 - 2²⁷ = 61419478543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61553696273) 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, 136785 + ... + 376586.

It is an arithmetic number, because the mean of its divisors is an integer number (5433529248).

Almost surely, 2^61553696271 is an apocalyptic number.

61553696271 is a deficient number, since it is larger than the sum of its proper divisors (25382771697).

61553696271 is a wasteful number, since it uses less digits than its factorization.

61553696271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515742.

The product of its digits is 2041200, while the sum is 51.

The spelling of 61553696271 in words is "sixty-one billion, five hundred fifty-three million, six hundred ninety-six thousand, two hundred seventy-one".