61001005556 has 6 divisors (see below), whose sum is σ = 106751759730. Its totient is φ = 30500502776.

The previous prime is 61001005547. The next prime is 61001005589. The reversal of 61001005556 is 65550010016.

It can be written as a sum of positive squares in only one way, i.e., 57104749156 + 3896256400 = 238966^2 + 62420^2 .

It is a super-2 number, since 2×61001005556² (a number of 22 digits) contains 22 as substring.

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, 7625125691 + ... + 7625125698.

It is an arithmetic number, because the mean of its divisors is an integer number (17791959955).

Almost surely, 2^61001005556 is an apocalyptic number.

It is an amenable number.

61001005556 is a deficient number, since it is larger than the sum of its proper divisors (45750754174).

61001005556 is a wasteful number, since it uses less digits than its factorization.

61001005556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15250251393 (or 15250251391 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 29.

The spelling of 61001005556 in words is "sixty-one billion, one million, five thousand, five hundred fifty-six".