402155215251 has 8 divisors (see below), whose sum is σ = 545295207360. Its totient is φ = 263559349992.

The previous prime is 402155215247. The next prime is 402155215289. The reversal of 402155215251 is 152512551204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 402155215251 - 2² = 402155215247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402155215291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1136031505 + ... + 1136031858.

It is an arithmetic number, because the mean of its divisors is an integer number (68161900920).

Almost surely, 2^402155215251 is an apocalyptic number.

402155215251 is a deficient number, since it is larger than the sum of its proper divisors (143139992109).

402155215251 is a wasteful number, since it uses less digits than its factorization.

402155215251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2272063425.

The product of its (nonzero) digits is 20000, while the sum is 33.

Adding to 402155215251 its reverse (152512551204), we get a palindrome (554667766455).

The spelling of 402155215251 in words is "four hundred two billion, one hundred fifty-five million, two hundred fifteen thousand, two hundred fifty-one".