251958461098 has 4 divisors (see below), whose sum is σ = 377937691650. Its totient is φ = 125979230548.

The previous prime is 251958461093. The next prime is 251958461101. The reversal of 251958461098 is 890164859152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 235503472369 + 16454988729 = 485287^2 + 128277^2 .

It is a super-2 number, since 2×251958461098² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (251958461093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62989615273 + ... + 62989615276.

Almost surely, 2^251958461098 is an apocalyptic number.

251958461098 is a deficient number, since it is larger than the sum of its proper divisors (125979230552).

251958461098 is a wasteful number, since it uses less digits than its factorization.

251958461098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125979230551.

The product of its (nonzero) digits is 6220800, while the sum is 58.

The spelling of 251958461098 in words is "two hundred fifty-one billion, nine hundred fifty-eight million, four hundred sixty-one thousand, ninety-eight".