1265505510 has 16 divisors (see below), whose sum is σ = 3037213296. Its totient is φ = 337468128.

The previous prime is 1265505499. The next prime is 1265505541. The reversal of 1265505510 is 155055621.

1265505510 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 42183517 = 1265505510 / (1 + 2 + 6 + 5 + 5 + 0 + 5 + 5 + 1 + 0).

It is a congruent number.

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, 21091729 + ... + 21091788.

It is an arithmetic number, because the mean of its divisors is an integer number (189825831).

Almost surely, 2^1265505510 is an apocalyptic number.

1265505510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1265505510 is an abundant number, since it is smaller than the sum of its proper divisors (1771707786).

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

1265505510 is a wasteful number, since it uses less digits than its factorization.

1265505510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42183527.

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 1265505510 is about 35573.9442569980. The cubic root of 1265505510 is about 1081.6531352960.

The spelling of 1265505510 in words is "one billion, two hundred sixty-five million, five hundred five thousand, five hundred ten".