1265057078 has 4 divisors (see below), whose sum is σ = 1897585620. Its totient is φ = 632528538.

The previous prime is 1265057039. The next prime is 1265057113. The reversal of 1265057078 is 8707505621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8707505621 = 17 ⋅512206213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316264268 + ... + 316264271.

It is an arithmetic number, because the mean of its divisors is an integer number (474396405).

Almost surely, 2^1265057078 is an apocalyptic number.

1265057078 is a deficient number, since it is larger than the sum of its proper divisors (632528542).

1265057078 is an equidigital number, since it uses as much as digits as its factorization.

1265057078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632528541.

The product of its (nonzero) digits is 117600, while the sum is 41.

The square root of 1265057078 is about 35567.6408832523. The cubic root of 1265057078 is about 1081.5253589046.

The spelling of 1265057078 in words is "one billion, two hundred sixty-five million, fifty-seven thousand, seventy-eight".