1665037901650 has 24 divisors (see below), whose sum is σ = 3097082063124. Its totient is φ = 665991168000.

The previous prime is 1665037901627. The next prime is 1665037901699. The reversal of 1665037901650 is 561097305661.

It can be written as a sum of positive squares in 6 ways, for example, as 243480072969 + 1421557828681 = 493437^2 + 1192291^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1665037901594 and 1665037901603.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 836050 + ... + 2007250.

Almost surely, 2^{1665037901650} is an apocalyptic number.

1665037901650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1665037901650 is a deficient number, since it is larger than the sum of its proper divisors (1432044161474).

1665037901650 is a wasteful number, since it uses less digits than its factorization.

1665037901650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199646 (or 1199641 counting only the distinct ones).

The product of its (nonzero) digits is 1020600, while the sum is 49.

The spelling of 1665037901650 in words is "one trillion, six hundred sixty-five billion, thirty-seven million, nine hundred one thousand, six hundred fifty".