661286143127040 has 80 divisors (see below), whose sum is σ = 2114049138833808. Its totient is φ = 176342971498496.

The previous prime is 661286143127033. The next prime is 661286143127083. The reversal of 661286143127040 is 40721341682166.

It is a tau number, because it is divible by the number of its divisors (80).

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, 43052475597 + ... + 43052490956.

Almost surely, 2^{661286143127040} is an apocalyptic number.

661286143127040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

661286143127040 is an abundant number, since it is smaller than the sum of its proper divisors (1452762995706768).

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

661286143127040 is an equidigital number, since it uses as much as digits as its factorization.

661286143127040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86104966579 (or 86104966563 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 51.

The spelling of 661286143127040 in words is "six hundred sixty-one trillion, two hundred eighty-six billion, one hundred forty-three million, one hundred twenty-seven thousand, forty".