78215773876045 has 32 divisors (see below), whose sum is σ = 101765051337600. Its totient is φ = 57367283132160.

The previous prime is 78215773875983. The next prime is 78215773876049. The reversal of 78215773876045 is 54067837751287.

It is a happy number.

It is not a de Polignac number, because 78215773876045 - 2⁷ = 78215773875917 is a prime.

It is a super-2 number, since 2×78215773876045² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78215773876049) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128419522 + ... + 129027148.

It is an arithmetic number, because the mean of its divisors is an integer number (3180157854300).

Almost surely, 2^{78215773876045} is an apocalyptic number.

It is an amenable number.

78215773876045 is a deficient number, since it is larger than the sum of its proper divisors (23549277461555).

78215773876045 is a wasteful number, since it uses less digits than its factorization.

78215773876045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621085.

The product of its (nonzero) digits is 553190400, while the sum is 70.

The spelling of 78215773876045 in words is "seventy-eight trillion, two hundred fifteen billion, seven hundred seventy-three million, eight hundred seventy-six thousand, forty-five".