406525531504640 has 120 divisors (see below), whose sum is σ = 975761551638720. Its totient is φ = 162588536864768.

The previous prime is 406525531504627. The next prime is 406525531504759. The reversal of 406525531504640 is 46405135525604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 621363929 + ... + 622017831.

It is an arithmetic number, because the mean of its divisors is an integer number (8131346263656).

Almost surely, 2^{406525531504640} is an apocalyptic number.

406525531504640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 406525531504640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (487880775819360).

406525531504640 is an abundant number, since it is smaller than the sum of its proper divisors (569236020134080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

406525531504640 is an frugal number, since it uses more digits than its factorization.

406525531504640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661525 (or 661499 counting only the distinct ones).

The product of its (nonzero) digits is 8640000, while the sum is 50.

The spelling of 406525531504640 in words is "four hundred six trillion, five hundred twenty-five billion, five hundred thirty-one million, five hundred four thousand, six hundred forty".