402561302422551 has 4 divisors (see below), whose sum is σ = 536748403230072. Its totient is φ = 268374201615032.

The previous prime is 402561302422549. The next prime is 402561302422561. The reversal of 402561302422551 is 155224203165204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402561302422551 - 2¹ = 402561302422549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402561302422561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67093550403756 + ... + 67093550403761.

It is an arithmetic number, because the mean of its divisors is an integer number (134187100807518).

Almost surely, 2^{402561302422551} is an apocalyptic number.

402561302422551 is a deficient number, since it is larger than the sum of its proper divisors (134187100807521).

402561302422551 is a wasteful number, since it uses less digits than its factorization.

402561302422551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134187100807520.

The product of its (nonzero) digits is 576000, while the sum is 42.

Adding to 402561302422551 its reverse (155224203165204), we get a palindrome (557785505587755).

The spelling of 402561302422551 in words is "four hundred two trillion, five hundred sixty-one billion, three hundred two million, four hundred twenty-two thousand, five hundred fifty-one".