1641909651560 has 32 divisors (see below), whose sum is σ = 3911608289160. Its totient is φ = 618130692096.

The previous prime is 1641909651553. The next prime is 1641909651581. The reversal of 1641909651560 is 651569091461.

It can be written as a sum of positive squares in 4 ways, for example, as 1455511950916 + 186397700644 = 1206446^2 + 431738^2 .

It is a super-2 number, since 2×1641909651560² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

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, 1207285829 + ... + 1207287188.

Almost surely, 2^{1641909651560} is an apocalyptic number.

1641909651560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1641909651560 is an abundant number, since it is smaller than the sum of its proper divisors (2269698637600).

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

1641909651560 is a wasteful number, since it uses less digits than its factorization.

1641909651560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2414573045 (or 2414573041 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 53.

The spelling of 1641909651560 in words is "one trillion, six hundred forty-one billion, nine hundred nine million, six hundred fifty-one thousand, five hundred sixty".