401520545551 has 4 divisors (see below), whose sum is σ = 401523837552. Its totient is φ = 401517253552.

The previous prime is 401520545533. The next prime is 401520545561. The reversal of 401520545551 is 155545025104.

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 401520545551 - 2¹⁹ = 401520021263 is a prime.

It is a super-2 number, since 2×401520545551² (a number of 24 digits) contains 22 as substring.

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 401520545551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401520545561) 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, 1455715 + ... + 1709428.

It is an arithmetic number, because the mean of its divisors is an integer number (100380959388).

Almost surely, 2^401520545551 is an apocalyptic number.

401520545551 is a deficient number, since it is larger than the sum of its proper divisors (3292001).

401520545551 is a wasteful number, since it uses less digits than its factorization.

401520545551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3292000.

The product of its (nonzero) digits is 100000, while the sum is 37.

The spelling of 401520545551 in words is "four hundred one billion, five hundred twenty million, five hundred forty-five thousand, five hundred fifty-one".