261451011613011 has 48 divisors (see below), whose sum is σ = 385728868022400. Its totient is φ = 157400285447680.

The previous prime is 261451011613007. The next prime is 261451011613013. The reversal of 261451011613011 is 110316110154162.

It is a happy number.

It is not a de Polignac number, because 261451011613011 - 2² = 261451011613007 is a prime.

It is a super-2 number, since 2×261451011613011² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (261451011613013) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58198000 + ... + 62529266.

It is an arithmetic number, because the mean of its divisors is an integer number (8036018083800).

Almost surely, 2^{261451011613011} is an apocalyptic number.

261451011613011 is a deficient number, since it is larger than the sum of its proper divisors (124277856409389).

261451011613011 is a wasteful number, since it uses less digits than its factorization.

261451011613011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4332400 (or 4332389 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 33.

Adding to 261451011613011 its reverse (110316110154162), we get a palindrome (371767121767173).

The spelling of 261451011613011 in words is "two hundred sixty-one trillion, four hundred fifty-one billion, eleven million, six hundred thirteen thousand, eleven".