61197502081 has 4 divisors (see below), whose sum is σ = 61216214464. Its totient is φ = 61178789700.

The previous prime is 61197502063. The next prime is 61197502117. The reversal of 61197502081 is 18020579116.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61197502081 - 2¹⁵ = 61197469313 is a prime.

It is a super-2 number, since 2×61197502081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61197502001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9351285 + ... + 9357826.

It is an arithmetic number, because the mean of its divisors is an integer number (15304053616).

Almost surely, 2^61197502081 is an apocalyptic number.

It is an amenable number.

61197502081 is a deficient number, since it is larger than the sum of its proper divisors (18712383).

61197502081 is a wasteful number, since it uses less digits than its factorization.

61197502081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18712382.

The product of its (nonzero) digits is 30240, while the sum is 40.

The spelling of 61197502081 in words is "sixty-one billion, one hundred ninety-seven million, five hundred two thousand, eighty-one".