19975308642 has 32 divisors (see below), whose sum is σ = 44437987200. Its totient is φ = 6651174384.

The previous prime is 19975308641. The next prime is 19975308673. The reversal of 19975308642 is 24680357991.

19975308642 is a `hidden beast` number, since 19 + 97 + 530 + 8 + 6 + 4 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (19975308641) 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, 151633 + ... + 250884.

It is an arithmetic number, because the mean of its divisors is an integer number (1388687100).

It is a 2-persistent number, because it is pandigital, and so is 2⋅19975308642 = 39950617284, but 3⋅19975308642 = 59925925926 is not.

Almost surely, 2^19975308642 is an apocalyptic number.

19975308642 is an abundant number, since it is smaller than the sum of its proper divisors (24462678558).

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

19975308642 is a wasteful number, since it uses less digits than its factorization.

19975308642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403447 (or 403441 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 19975308642 in words is "nineteen billion, nine hundred seventy-five million, three hundred eight thousand, six hundred forty-two".