1661501560610 has 16 divisors (see below), whose sum is σ = 2991389300856. Its totient is φ = 664448070528.

The previous prime is 1661501560577. The next prime is 1661501560619. The reversal of 1661501560610 is 160651051661.

It can be written as a sum of positive squares in 4 ways, for example, as 1462084833889 + 199416726721 = 1209167^2 + 446561^2 .

It is not an unprimeable number, because it can be changed into a prime (1661501560619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19023467 + ... + 19110606.

Almost surely, 2^{1661501560610} is an apocalyptic number.

1661501560610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661501560610 is a deficient number, since it is larger than the sum of its proper divisors (1329887740246).

1661501560610 is a wasteful number, since it uses less digits than its factorization.

1661501560610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38138437.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 1661501560610 in words is "one trillion, six hundred sixty-one billion, five hundred one million, five hundred sixty thousand, six hundred ten".