820664414526 has 64 divisors (see below), whose sum is σ = 1799044805376. Its totient is φ = 247505798400.

The previous prime is 820664414519. The next prime is 820664414533. The reversal of 820664414526 is 625414466028.

It is an interprime number because it is at equal distance from previous prime (820664414519) and next prime (820664414533).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54122386 + ... + 54137546.

It is an arithmetic number, because the mean of its divisors is an integer number (28110075084).

Almost surely, 2^820664414526 is an apocalyptic number.

820664414526 is an abundant number, since it is smaller than the sum of its proper divisors (978380390850).

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

820664414526 is a wasteful number, since it uses less digits than its factorization.

820664414526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19017.

The product of its (nonzero) digits is 2211840, while the sum is 48.

The spelling of 820664414526 in words is "eight hundred twenty billion, six hundred sixty-four million, four hundred fourteen thousand, five hundred twenty-six".