1295906401690 has 12 divisors (see below), whose sum is σ = 2332638002826. Its totient is φ = 518361120728.

The previous prime is 1295906401687. The next prime is 1295906401693. The reversal of 1295906401690 is 961046095921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1295906401687) and next prime (1295906401693).

It can be written as a sum of positive squares in only one way, i.e., 1166315761521 + 129590640169 = 1079961^2 + 359987^2 .

It is a super-2 number, since 2×1295906401690² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1295906401693) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3419877 + ... + 3779863.

Almost surely, 2^{1295906401690} is an apocalyptic number.

1295906401690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1295906401690 is a deficient number, since it is larger than the sum of its proper divisors (1036731601136).

1295906401690 is an frugal number, since it uses more digits than its factorization.

1295906401690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719981 (or 359994 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 52.

The spelling of 1295906401690 in words is "one trillion, two hundred ninety-five billion, nine hundred six million, four hundred one thousand, six hundred ninety".