151721030978 has 24 divisors (see below), whose sum is σ = 250376012796. Its totient is φ = 68902241760.

The previous prime is 151721030977. The next prime is 151721030987. The reversal of 151721030978 is 879030127151.

It can be written as a sum of positive squares in 2 ways, for example, as 151692333529 + 28697449 = 389477^2 + 5357^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (151721030977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10325 + ... + 550952.

Almost surely, 2^151721030978 is an apocalyptic number.

151721030978 is a deficient number, since it is larger than the sum of its proper divisors (98654981818).

151721030978 is a wasteful number, since it uses less digits than its factorization.

151721030978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562418 (or 562407 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 44.

The spelling of 151721030978 in words is "one hundred fifty-one billion, seven hundred twenty-one million, thirty thousand, nine hundred seventy-eight".