400035431551 has 32 divisors (see below), whose sum is σ = 471458880000. Its totient is φ = 339260777856.

The previous prime is 400035431539. The next prime is 400035431569. The reversal of 400035431551 is 155134530004.

It is a de Polignac number, because none of the positive numbers 2^k-400035431551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400035431531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31519815 + ... + 31532503.

It is an arithmetic number, because the mean of its divisors is an integer number (14733090000).

Almost surely, 2^400035431551 is an apocalyptic number.

400035431551 is a deficient number, since it is larger than the sum of its proper divisors (71423448449).

400035431551 is a wasteful number, since it uses less digits than its factorization.

400035431551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13676 (or 13662 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 400035431551 its reverse (155134530004), we get a palindrome (555169961555).

The spelling of 400035431551 in words is "four hundred billion, thirty-five million, four hundred thirty-one thousand, five hundred fifty-one".