19863157440 has 448 divisors, whose sum is σ = 74176128000. Its totient is φ = 4501389312.

The previous prime is 19863157411. The next prime is 19863157469. The reversal of 19863157440 is 4475136891.

It is an interprime number because it is at equal distance from previous prime (19863157411) and next prime (19863157469).

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 19863157440.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 58940952 + ... + 58941288.

Almost surely, 2^19863157440 is an apocalyptic number.

19863157440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19863157440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37088064000).

19863157440 is an abundant number, since it is smaller than the sum of its proper divisors (54312970560).

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

19863157440 is a wasteful number, since it uses less digits than its factorization.

19863157440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557 (or 533 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 19863157440 in words is "nineteen billion, eight hundred sixty-three million, one hundred fifty-seven thousand, four hundred forty".