1641696961240 has 64 divisors (see below), whose sum is σ = 4284514080000. Its totient is φ = 554466515328.

The previous prime is 1641696961207. The next prime is 1641696961241. The reversal of 1641696961240 is 421696961461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641696961241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43736490 + ... + 43774009.

It is an arithmetic number, because the mean of its divisors is an integer number (66945532500).

Almost surely, 2^{1641696961240} is an apocalyptic number.

1641696961240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1641696961240 is an abundant number, since it is smaller than the sum of its proper divisors (2642817118760).

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

1641696961240 is a wasteful number, since it uses less digits than its factorization.

1641696961240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87510584 (or 87510580 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 55.

The spelling of 1641696961240 in words is "one trillion, six hundred forty-one billion, six hundred ninety-six million, nine hundred sixty-one thousand, two hundred forty".