61551965825 has 24 divisors (see below), whose sum is σ = 87248457408. Its totient is φ = 42197129280.

The previous prime is 61551965789. The next prime is 61551965837. The reversal of 61551965825 is 52856915516.

It is not a de Polignac number, because 61551965825 - 2¹⁰ = 61551964801 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 747134 + ... + 825416.

It is an arithmetic number, because the mean of its divisors is an integer number (3635352392).

Almost surely, 2^61551965825 is an apocalyptic number.

It is an amenable number.

61551965825 is a deficient number, since it is larger than the sum of its proper divisors (25696491583).

61551965825 is a wasteful number, since it uses less digits than its factorization.

61551965825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82793 (or 82788 counting only the distinct ones).

The product of its digits is 3240000, while the sum is 53.

The spelling of 61551965825 in words is "sixty-one billion, five hundred fifty-one million, nine hundred sixty-five thousand, eight hundred twenty-five".