261414331624 has 8 divisors (see below), whose sum is σ = 490151871810. Its totient is φ = 130707165808.

The previous prime is 261414331621. The next prime is 261414331631. The reversal of 261414331624 is 426133414162.

It can be written as a sum of positive squares in only one way, i.e., 220695127524 + 40719204100 = 469782^2 + 201790^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (261414331621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16338395719 + ... + 16338395734.

Almost surely, 2^261414331624 is an apocalyptic number.

It is an amenable number.

261414331624 is a deficient number, since it is larger than the sum of its proper divisors (228737540186).

261414331624 is a wasteful number, since it uses less digits than its factorization.

261414331624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32676791459 (or 32676791455 counting only the distinct ones).

The product of its digits is 82944, while the sum is 37.

Adding to 261414331624 its reverse (426133414162), we get a palindrome (687547745786).

The spelling of 261414331624 in words is "two hundred sixty-one billion, four hundred fourteen million, three hundred thirty-one thousand, six hundred twenty-four".