19497452640 has 48 divisors (see below), whose sum is σ = 61416977328. Its totient is φ = 5199320576.

The previous prime is 19497452617. The next prime is 19497452669. The reversal of 19497452640 is 4625479491.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20309367 + ... + 20310326.

It is an arithmetic number, because the mean of its divisors is an integer number (1279520361).

Almost surely, 2^19497452640 is an apocalyptic number.

19497452640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19497452640 is an abundant number, since it is smaller than the sum of its proper divisors (41919524688).

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

19497452640 is a wasteful number, since it uses less digits than its factorization.

19497452640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40619711 (or 40619703 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 19497452640 in words is "nineteen billion, four hundred ninety-seven million, four hundred fifty-two thousand, six hundred forty".