19661377530 has 32 divisors (see below), whose sum is σ = 47263829184. Its totient is φ = 5234531456.

The previous prime is 19661377487. The next prime is 19661377531. The reversal of 19661377530 is 3577316691.

It is a self number, because there is not a number n which added to its sum of digits gives 19661377530.

It is not an unprimeable number, because it can be changed into a prime (19661377531) 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, 512592 + ... + 549611.

It is an arithmetic number, because the mean of its divisors is an integer number (1476994662).

Almost surely, 2^19661377530 is an apocalyptic number.

19661377530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19661377530 is an abundant number, since it is smaller than the sum of its proper divisors (27602451654).

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

19661377530 is a wasteful number, since it uses less digits than its factorization.

19661377530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062830.

The product of its (nonzero) digits is 714420, while the sum is 48.

The spelling of 19661377530 in words is "nineteen billion, six hundred sixty-one million, three hundred seventy-seven thousand, five hundred thirty".