61529299261 has 4 divisors (see below), whose sum is σ = 62572168800. Its totient is φ = 60486429724.

The previous prime is 61529299259. The next prime is 61529299267. The reversal of 61529299261 is 16299292516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61529299261 - 2¹ = 61529299259 is a prime.

It is a super-2 number, since 2×61529299261² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61529299199 and 61529299208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61529299267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521434681 + ... + 521434798.

It is an arithmetic number, because the mean of its divisors is an integer number (15643042200).

Almost surely, 2^61529299261 is an apocalyptic number.

It is an amenable number.

61529299261 is a deficient number, since it is larger than the sum of its proper divisors (1042869539).

61529299261 is a wasteful number, since it uses less digits than its factorization.

61529299261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042869538.

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

The spelling of 61529299261 in words is "sixty-one billion, five hundred twenty-nine million, two hundred ninety-nine thousand, two hundred sixty-one".