55501997187 has 32 divisors (see below), whose sum is σ = 91110071808. Its totient is φ = 29266177536.

The previous prime is 55501997167. The next prime is 55501997207. The reversal of 55501997187 is 78179910555.

It is an interprime number because it is at equal distance from previous prime (55501997167) and next prime (55501997207).

It is not a de Polignac number, because 55501997187 - 2⁷ = 55501997059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55501997147) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 842683 + ... + 906155.

It is an arithmetic number, because the mean of its divisors is an integer number (2847189744).

Almost surely, 2^55501997187 is an apocalyptic number.

55501997187 is a deficient number, since it is larger than the sum of its proper divisors (35608074621).

55501997187 is a wasteful number, since it uses less digits than its factorization.

55501997187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66699.

The product of its (nonzero) digits is 3969000, while the sum is 57.

The spelling of 55501997187 in words is "fifty-five billion, five hundred one million, nine hundred ninety-seven thousand, one hundred eighty-seven".