15961853440 has 80 divisors (see below), whose sum is σ = 41215049568. Its totient is φ = 5893595136.

The previous prime is 15961853429. The next prime is 15961853449. The reversal of 15961853440 is 4435816951.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15961853449) 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, 206532 + ... + 273091.

Almost surely, 2^15961853440 is an apocalyptic number.

15961853440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15961853440 is an abundant number, since it is smaller than the sum of its proper divisors (25253196128).

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

15961853440 is an equidigital number, since it uses as much as digits as its factorization.

15961853440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479659 (or 479643 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 15961853440 in words is "fifteen billion, nine hundred sixty-one million, eight hundred fifty-three thousand, four hundred forty".