320191156440 has 192 divisors, whose sum is σ = 1116376279200. Its totient is φ = 82439949312.

The previous prime is 320191156357. The next prime is 320191156499. The reversal of 320191156440 is 44651191023.

It is a happy number.

320191156440 is a `hidden beast` number, since 3 + 2 + 0 + 1 + 9 + 1 + 1 + 5 + 644 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 320191156395 and 320191156404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 286077 + ... + 849836.

Almost surely, 2^320191156440 is an apocalyptic number.

320191156440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

320191156440 is an abundant number, since it is smaller than the sum of its proper divisors (796185122760).

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

320191156440 is a wasteful number, since it uses less digits than its factorization.

320191156440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135968 (or 1135952 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 320191156440 in words is "three hundred twenty billion, one hundred ninety-one million, one hundred fifty-six thousand, four hundred forty".