61520555343 has 32 divisors (see below), whose sum is σ = 90260916480. Its totient is φ = 37040451840.

The previous prime is 61520555303. The next prime is 61520555377. The reversal of 61520555343 is 34355502516.

It is not a de Polignac number, because 61520555343 - 2⁸ = 61520555087 is a prime.

It is a super-2 number, since 2×61520555343² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61520555303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 422155 + ... + 548867.

It is an arithmetic number, because the mean of its divisors is an integer number (2820653640).

Almost surely, 2^61520555343 is an apocalyptic number.

61520555343 is a deficient number, since it is larger than the sum of its proper divisors (28740361137).

61520555343 is a wasteful number, since it uses less digits than its factorization.

61520555343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126999.

The product of its (nonzero) digits is 270000, while the sum is 39.

The spelling of 61520555343 in words is "sixty-one billion, five hundred twenty million, five hundred fifty-five thousand, three hundred forty-three".