402554121555 has 16 divisors (see below), whose sum is σ = 644099942304. Its totient is φ = 214691082240.

The previous prime is 402554121547. The next prime is 402554121649. The reversal of 402554121555 is 555121455204.

It is a happy number.

It is not a de Polignac number, because 402554121555 - 2³ = 402554121547 is a prime.

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, 549265 + ... + 1052045.

It is an arithmetic number, because the mean of its divisors is an integer number (40256246394).

Almost surely, 2^402554121555 is an apocalyptic number.

402554121555 is a deficient number, since it is larger than the sum of its proper divisors (241545820749).

402554121555 is a wasteful number, since it uses less digits than its factorization.

402554121555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556166.

The product of its (nonzero) digits is 200000, while the sum is 39.

Adding to 402554121555 its reverse (555121455204), we get a palindrome (957675576759).

The spelling of 402554121555 in words is "four hundred two billion, five hundred fifty-four million, one hundred twenty-one thousand, five hundred fifty-five".