19771472540 has 24 divisors (see below), whose sum is σ = 41612583600. Its totient is φ = 7890971648.

The previous prime is 19771472537. The next prime is 19771472573. The reversal of 19771472540 is 4527417791.

It is a happy number.

It is a super-2 number, since 2×19771472540² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1091882 + ... + 1109841.

It is an arithmetic number, because the mean of its divisors is an integer number (1733857650).

Almost surely, 2^19771472540 is an apocalyptic number.

19771472540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19771472540 is an abundant number, since it is smaller than the sum of its proper divisors (21841111060).

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

19771472540 is a wasteful number, since it uses less digits than its factorization.

19771472540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2202181 (or 2202179 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 47.

The spelling of 19771472540 in words is "nineteen billion, seven hundred seventy-one million, four hundred seventy-two thousand, five hundred forty".