1661400702960 has 80 divisors (see below), whose sum is σ = 5172446826144. Its totient is φ = 441138712576.

The previous prime is 1661400702931. The next prime is 1661400703007. The reversal of 1661400702960 is 692070041661.

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 15 ways as a sum of consecutive naturals, for example, 14799237 + ... + 14911076.

Almost surely, 2^{1661400702960} is an apocalyptic number.

1661400702960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661400702960 is an abundant number, since it is smaller than the sum of its proper divisors (3511046123184).

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

1661400702960 is a wasteful number, since it uses less digits than its factorization.

1661400702960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29710562 (or 29710556 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The spelling of 1661400702960 in words is "one trillion, six hundred sixty-one billion, four hundred million, seven hundred two thousand, nine hundred sixty".