61554397628 has 6 divisors (see below), whose sum is σ = 107720195856. Its totient is φ = 30777198812.

The previous prime is 61554397601. The next prime is 61554397631. The reversal of 61554397628 is 82679345516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7694299700 + ... + 7694299707.

It is an arithmetic number, because the mean of its divisors is an integer number (17953365976).

Almost surely, 2^61554397628 is an apocalyptic number.

It is an amenable number.

61554397628 is a deficient number, since it is larger than the sum of its proper divisors (46165798228).

61554397628 is a wasteful number, since it uses less digits than its factorization.

61554397628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15388599411 (or 15388599409 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 56.

The spelling of 61554397628 in words is "sixty-one billion, five hundred fifty-four million, three hundred ninety-seven thousand, six hundred twenty-eight".