1264378015560 has 128 divisors (see below), whose sum is σ = 4140376248960. Its totient is φ = 306337228800.

The previous prime is 1264378015559. The next prime is 1264378015567. The reversal of 1264378015560 is 655108734621.

It is a super-2 number, since 2×1264378015560² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1264378015567) 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, 1993434 + ... + 2550006.

It is an arithmetic number, because the mean of its divisors is an integer number (32346689445).

Almost surely, 2^{1264378015560} is an apocalyptic number.

1264378015560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1264378015560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2070188124480).

1264378015560 is an abundant number, since it is smaller than the sum of its proper divisors (2875998233400).

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

1264378015560 is a wasteful number, since it uses less digits than its factorization.

1264378015560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558319 (or 558315 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 1264378015560 in words is "one trillion, two hundred sixty-four billion, three hundred seventy-eight million, fifteen thousand, five hundred sixty".