61663156 has 6 divisors (see below), whose sum is σ = 107910530. Its totient is φ = 30831576.

The previous prime is 61663117. The next prime is 61663169. The reversal of 61663156 is 65136616.

It can be written as a sum of positive squares in only one way, i.e., 61371556 + 291600 = 7834^2 + 540^2 .

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, 7707891 + ... + 7707898.

Almost surely, 2^61663156 is an apocalyptic number.

It is an amenable number.

61663156 is a deficient number, since it is larger than the sum of its proper divisors (46247374).

61663156 is a wasteful number, since it uses less digits than its factorization.

61663156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15415793 (or 15415791 counting only the distinct ones).

The product of its digits is 19440, while the sum is 34.

The square root of 61663156 is about 7852.5891271605. The cubic root of 61663156 is about 395.0710890585.

The spelling of 61663156 in words is "sixty-one million, six hundred sixty-three thousand, one hundred fifty-six".