51220252455 has 16 divisors (see below), whose sum is σ = 82007478240. Its totient is φ = 27299109888.

The previous prime is 51220252453. The next prime is 51220252469. The reversal of 51220252455 is 55425202215.

It is a happy number.

It is not a de Polignac number, because 51220252455 - 2¹ = 51220252453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51220252453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1124302 + ... + 1168971.

It is an arithmetic number, because the mean of its divisors is an integer number (5125467390).

Almost surely, 2^51220252455 is an apocalyptic number.

51220252455 is a deficient number, since it is larger than the sum of its proper divisors (30787225785).

51220252455 is a wasteful number, since it uses less digits than its factorization.

51220252455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2294770.

The product of its (nonzero) digits is 40000, while the sum is 33.

The spelling of 51220252455 in words is "fifty-one billion, two hundred twenty million, two hundred fifty-two thousand, four hundred fifty-five".