78756370661952 has 42 divisors (see below), whose sum is σ = 225740916603878. Its totient is φ = 26252123553792.

The previous prime is 78756370661929. The next prime is 78756370661959. The reversal of 78756370661952 is 25916607365787.

It is a happy number.

78756370661952 is a `hidden beast` number, since 7 + 8 + 7 + 5 + 6 + 370 + 66 + 195 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 71592311578176 + 7164059083776 = 8461224^2 + 2676576^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (78756370661959) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68364904513 + ... + 68364905664.

Almost surely, 2^{78756370661952} is an apocalyptic number.

78756370661952 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

78756370661952 is an abundant number, since it is smaller than the sum of its proper divisors (146984545941926).

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

78756370661952 is a wasteful number, since it uses less digits than its factorization.

78756370661952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136729810195 (or 136729810182 counting only the distinct ones).

The product of its (nonzero) digits is 800150400, while the sum is 72.

The spelling of 78756370661952 in words is "seventy-eight trillion, seven hundred fifty-six billion, three hundred seventy million, six hundred sixty-one thousand, nine hundred fifty-two".