126774251690 has 16 divisors (see below), whose sum is σ = 235554739200. Its totient is φ = 49073903760.

The previous prime is 126774251683. The next prime is 126774251693. The reversal of 126774251690 is 96152477621.

It is a happy number.

It is a super-2 number, since 2×126774251690² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (126774251693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204474290 + ... + 204474909.

It is an arithmetic number, because the mean of its divisors is an integer number (14722171200).

Almost surely, 2^126774251690 is an apocalyptic number.

126774251690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

126774251690 is a deficient number, since it is larger than the sum of its proper divisors (108780487510).

126774251690 is a wasteful number, since it uses less digits than its factorization.

126774251690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408949237.

The product of its (nonzero) digits is 1270080, while the sum is 50.

The spelling of 126774251690 in words is "one hundred twenty-six billion, seven hundred seventy-four million, two hundred fifty-one thousand, six hundred ninety".