406885644551 has 4 divisors (see below), whose sum is σ = 416809684704. Its totient is φ = 396961604400.

The previous prime is 406885644547. The next prime is 406885644553. The reversal of 406885644551 is 155446588604.

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 406885644551 - 2² = 406885644547 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 (406885644553) 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, 4962020015 + ... + 4962020096.

It is an arithmetic number, because the mean of its divisors is an integer number (104202421176).

Almost surely, 2^406885644551 is an apocalyptic number.

406885644551 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

406885644551 is a deficient number, since it is larger than the sum of its proper divisors (9924040153).

406885644551 is an equidigital number, since it uses as much as digits as its factorization.

406885644551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9924040152.

The product of its (nonzero) digits is 18432000, while the sum is 56.

The spelling of 406885644551 in words is "four hundred six billion, eight hundred eighty-five million, six hundred forty-four thousand, five hundred fifty-one".