1315861888690 has 16 divisors (see below), whose sum is σ = 2377767557592. Its totient is φ = 524296720384.

The previous prime is 1315861888643. The next prime is 1315861888709. The reversal of 1315861888690 is 968881685131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1270532498041 + 45329390649 = 1127179^2 + 212907^2 .

It is a super-2 number, since 2×1315861888690² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256001689 + ... + 256006828.

Almost surely, 2^{1315861888690} is an apocalyptic number.

1315861888690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1315861888690 is a deficient number, since it is larger than the sum of its proper divisors (1061905668902).

1315861888690 is a wasteful number, since it uses less digits than its factorization.

1315861888690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512008781.

The product of its (nonzero) digits is 19906560, while the sum is 64.

The spelling of 1315861888690 in words is "one trillion, three hundred fifteen billion, eight hundred sixty-one million, eight hundred eighty-eight thousand, six hundred ninety".