401889421551 has 4 divisors (see below), whose sum is σ = 535852562072. Its totient is φ = 267926281032.

The previous prime is 401889421547. The next prime is 401889421573. The reversal of 401889421551 is 155124988104.

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

It is not a de Polignac number, because 401889421551 - 2² = 401889421547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 401889421551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401889421511) 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, 66981570256 + ... + 66981570261.

It is an arithmetic number, because the mean of its divisors is an integer number (133963140518).

Almost surely, 2^401889421551 is an apocalyptic number.

401889421551 is a deficient number, since it is larger than the sum of its proper divisors (133963140521).

401889421551 is a wasteful number, since it uses less digits than its factorization.

401889421551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133963140520.

The product of its (nonzero) digits is 460800, while the sum is 48.

The spelling of 401889421551 in words is "four hundred one billion, eight hundred eighty-nine million, four hundred twenty-one thousand, five hundred fifty-one".