61155216425 has 6 divisors (see below), whose sum is σ = 75832468398. Its totient is φ = 48924173120.

The previous prime is 61155216401. The next prime is 61155216431. The reversal of 61155216425 is 52461255116.

It can be written as a sum of positive squares in 3 ways, for example, as 11894301721 + 49260914704 = 109061^2 + 221948^2 .

It is not a de Polignac number, because 61155216425 - 2⁶ = 61155216361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1223104304 + ... + 1223104353.

It is an arithmetic number, because the mean of its divisors is an integer number (12638744733).

Almost surely, 2^61155216425 is an apocalyptic number.

It is an amenable number.

61155216425 is a deficient number, since it is larger than the sum of its proper divisors (14677251973).

61155216425 is a wasteful number, since it uses less digits than its factorization.

61155216425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2446208667 (or 2446208662 counting only the distinct ones).

The product of its digits is 72000, while the sum is 38.

The spelling of 61155216425 in words is "sixty-one billion, one hundred fifty-five million, two hundred sixteen thousand, four hundred twenty-five".