78145777308502 has 32 divisors (see below), whose sum is σ = 123868488729600. Its totient is φ = 36899468631168.

The previous prime is 78145777308493. The next prime is 78145777308551. The reversal of 78145777308502 is 20580377754187.

It is a happy number.

It is a super-2 number, since 2×78145777308502² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91036953 + ... + 91891339.

It is an arithmetic number, because the mean of its divisors is an integer number (3870890272800).

Almost surely, 2^{78145777308502} is an apocalyptic number.

78145777308502 is a deficient number, since it is larger than the sum of its proper divisors (45722711421098).

78145777308502 is a wasteful number, since it uses less digits than its factorization.

78145777308502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879660.

The product of its (nonzero) digits is 92198400, while the sum is 64.

The spelling of 78145777308502 in words is "seventy-eight trillion, one hundred forty-five billion, seven hundred seventy-seven million, three hundred eight thousand, five hundred two".