51135021555 has 16 divisors (see below), whose sum is σ = 82460258304. Its totient is φ = 27057270240.

The previous prime is 51135021547. The next prime is 51135021563. The reversal of 51135021555 is 55512053115.

It is an interprime number because it is at equal distance from previous prime (51135021547) and next prime (51135021563).

It is not a de Polignac number, because 51135021555 - 2³ = 51135021547 is a prime.

It is a super-2 number, since 2×51135021555² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13419361 + ... + 13423170.

It is an arithmetic number, because the mean of its divisors is an integer number (5153766144).

Almost surely, 2^51135021555 is an apocalyptic number.

51135021555 is a deficient number, since it is larger than the sum of its proper divisors (31325236749).

51135021555 is a wasteful number, since it uses less digits than its factorization.

51135021555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26842666.

The product of its (nonzero) digits is 18750, while the sum is 33.

The spelling of 51135021555 in words is "fifty-one billion, one hundred thirty-five million, twenty-one thousand, five hundred fifty-five".