19657142450 has 48 divisors (see below), whose sum is σ = 40060560960. Its totient is φ = 7116792000.

The previous prime is 19657142443. The next prime is 19657142503. The reversal of 19657142450 is 5424175691.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47915 + ... + 203985.

It is an arithmetic number, because the mean of its divisors is an integer number (834595020).

Almost surely, 2^19657142450 is an apocalyptic number.

19657142450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19657142450 is an abundant number, since it is smaller than the sum of its proper divisors (20403418510).

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

19657142450 is a wasteful number, since it uses less digits than its factorization.

19657142450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156323 (or 156318 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 19657142450 in words is "nineteen billion, six hundred fifty-seven million, one hundred forty-two thousand, four hundred fifty".