61273665 has 96 divisors (see below), whose sum is σ = 119508480. Its totient is φ = 30046464.

The previous prime is 61273649. The next prime is 61273691. The reversal of 61273665 is 56637216.

61273665 is a `hidden beast` number, since 612 + 7 + 36 + 6 + 5 = 666.

It is not a de Polignac number, because 61273665 - 2⁴ = 61273649 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1303672 + ... + 1303718.

It is an arithmetic number, because the mean of its divisors is an integer number (1244880).

Almost surely, 2^61273665 is an apocalyptic number.

It is an amenable number.

61273665 is a deficient number, since it is larger than the sum of its proper divisors (58234815).

61273665 is a wasteful number, since it uses less digits than its factorization.

61273665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 121 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 61273665 is about 7827.7496766312. The cubic root of 61273665 is about 394.2375185824.

The spelling of 61273665 in words is "sixty-one million, two hundred seventy-three thousand, six hundred sixty-five".