1265689998 has 12 divisors (see below), whose sum is σ = 2742328368. Its totient is φ = 421896660.

The previous prime is 1265689951. The next prime is 1265690009. The reversal of 1265689998 is 8999865621.

1265689998 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35158038 + ... + 35158073.

It is an arithmetic number, because the mean of its divisors is an integer number (228527364).

Almost surely, 2^1265689998 is an apocalyptic number.

1265689998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1265689998 is an abundant number, since it is smaller than the sum of its proper divisors (1476638370).

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

1265689998 is a wasteful number, since it uses less digits than its factorization.

1265689998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70316119 (or 70316116 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 63.

The square root of 1265689998 is about 35576.5371839363. The cubic root of 1265689998 is about 1081.7056946161.

The spelling of 1265689998 in words is "one billion, two hundred sixty-five million, six hundred eighty-nine thousand, nine hundred ninety-eight".