191945203511956 has 24 divisors (see below), whose sum is σ = 336175448364000. Its totient is φ = 95895077471904.

The previous prime is 191945203511953. The next prime is 191945203511989. The reversal of 191945203511956 is 659115302549191.

It is a super-2 number, since 2×191945203511956² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 191945203511894 and 191945203511903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191945203511953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 451360555 + ... + 451785613.

It is an arithmetic number, because the mean of its divisors is an integer number (14007310348500).

Almost surely, 2^{191945203511956} is an apocalyptic number.

It is an amenable number.

191945203511956 is a deficient number, since it is larger than the sum of its proper divisors (144230244852044).

191945203511956 is a wasteful number, since it uses less digits than its factorization.

191945203511956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515991 (or 515989 counting only the distinct ones).

The product of its (nonzero) digits is 13122000, while the sum is 61.

The spelling of 191945203511956 in words is "one hundred ninety-one trillion, nine hundred forty-five billion, two hundred three million, five hundred eleven thousand, nine hundred fifty-six".