401655543531 has 32 divisors (see below), whose sum is σ = 615229274880. Its totient is φ = 230520268800.

The previous prime is 401655543517. The next prime is 401655543623. The reversal of 401655543531 is 135345556104.

It is a happy number.

It is not a de Polignac number, because 401655543531 - 2¹³ = 401655535339 is a prime.

It is a super-2 number, since 2×401655543531² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401655542531) 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, 1399291 + ... + 1661723.

It is an arithmetic number, because the mean of its divisors is an integer number (19225914840).

Almost surely, 2^401655543531 is an apocalyptic number.

401655543531 is a deficient number, since it is larger than the sum of its proper divisors (213573731349).

401655543531 is a wasteful number, since it uses less digits than its factorization.

401655543531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264907.

The product of its (nonzero) digits is 540000, while the sum is 42.

The spelling of 401655543531 in words is "four hundred one billion, six hundred fifty-five million, five hundred forty-three thousand, five hundred thirty-one".