66461535154210 has 48 divisors (see below), whose sum is σ = 139164455358720. Its totient is φ = 22786461825120.

The previous prime is 66461535154199. The next prime is 66461535154277. The reversal of 66461535154210 is 1245153516466.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31934461 + ... + 33951919.

It is an arithmetic number, because the mean of its divisors is an integer number (2899259486640).

Almost surely, 2^{66461535154210} is an apocalyptic number.

66461535154210 is an abundant number, since it is smaller than the sum of its proper divisors (72702920204510).

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

66461535154210 is a wasteful number, since it uses less digits than its factorization.

66461535154210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084711 (or 2084704 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 49.

The spelling of 66461535154210 in words is "sixty-six trillion, four hundred sixty-one billion, five hundred thirty-five million, one hundred fifty-four thousand, two hundred ten".