1215078868757 has 8 divisors (see below), whose sum is σ = 1310275079736. Its totient is φ = 1120129601472.

The previous prime is 1215078868753. The next prime is 1215078868789. The reversal of 1215078868757 is 7578688705121.

It can be written as a sum of positive squares in 4 ways, for example, as 1117832356 + 1213961036401 = 33434^2 + 1101799^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1215078868757 - 2² = 1215078868753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1215078868693 and 1215078868702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215078868753) 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, 61725698 + ... + 61745379.

It is an arithmetic number, because the mean of its divisors is an integer number (163784384967).

Almost surely, 2^{1215078868757} is an apocalyptic number.

It is an amenable number.

1215078868757 is a deficient number, since it is larger than the sum of its proper divisors (95196210979).

1215078868757 is a wasteful number, since it uses less digits than its factorization.

1215078868757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123471847.

The product of its (nonzero) digits is 52684800, while the sum is 65.

The spelling of 1215078868757 in words is "one trillion, two hundred fifteen billion, seventy-eight million, eight hundred sixty-eight thousand, seven hundred fifty-seven".