19752991506 has 32 divisors (see below), whose sum is σ = 43945130880. Its totient is φ = 6576891408.

The previous prime is 19752991501. The next prime is 19752991519. The reversal of 19752991506 is 60519925791.

It is a super-2 number, since 2×19752991506² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

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 (19752991501) 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, 158301 + ... + 254096.

It is an arithmetic number, because the mean of its divisors is an integer number (1373285340).

Almost surely, 2^19752991506 is an apocalyptic number.

19752991506 is an abundant number, since it is smaller than the sum of its proper divisors (24192139374).

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

19752991506 is a wasteful number, since it uses less digits than its factorization.

19752991506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413295 (or 413289 counting only the distinct ones).

The product of its (nonzero) digits is 1530900, while the sum is 54.

The spelling of 19752991506 in words is "nineteen billion, seven hundred fifty-two million, nine hundred ninety-one thousand, five hundred six".