61555406626445 has 16 divisors (see below), whose sum is σ = 75247668023040. Its totient is φ = 48329003198784.

The previous prime is 61555406626379. The next prime is 61555406626457. The reversal of 61555406626445 is 54462660455516.

It is not a de Polignac number, because 61555406626445 - 2¹⁸ = 61555406364301 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 341447957 + ... + 341628186.

It is an arithmetic number, because the mean of its divisors is an integer number (4702979251440).

Almost surely, 2^{61555406626445} is an apocalyptic number.

It is an amenable number.

61555406626445 is a deficient number, since it is larger than the sum of its proper divisors (13692261396595).

61555406626445 is a wasteful number, since it uses less digits than its factorization.

61555406626445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683076484.

The product of its (nonzero) digits is 103680000, while the sum is 59.

The spelling of 61555406626445 in words is "sixty-one trillion, five hundred fifty-five billion, four hundred six million, six hundred twenty-six thousand, four hundred forty-five".