61219625477 has 8 divisors (see below), whose sum is σ = 62825400792. Its totient is φ = 59619212800.

The previous prime is 61219625459. The next prime is 61219625479. The reversal of 61219625477 is 77452691216.

It is a happy number.

It is a Cunningham number, because it is equal to 247426²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 2950010596 + 58269614881 = 54314^2 + 241391^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61219625477 - 2⁶ = 61219625413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61219625479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1317524 + ... + 1363197.

It is an arithmetic number, because the mean of its divisors is an integer number (7853175099).

Almost surely, 2^61219625477 is an apocalyptic number.

It is an amenable number.

61219625477 is a deficient number, since it is larger than the sum of its proper divisors (1605775315).

61219625477 is a wasteful number, since it uses less digits than its factorization.

61219625477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2681319.

The product of its digits is 1270080, while the sum is 50.

The spelling of 61219625477 in words is "sixty-one billion, two hundred nineteen million, six hundred twenty-five thousand, four hundred seventy-seven".