61651655 has 8 divisors (see below), whose sum is σ = 79672992. Its totient is φ = 45527328.

The previous prime is 61651649. The next prime is 61651669. The reversal of 61651655 is 55615616.

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 61651655 - 2⁸ = 61651399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474179 + ... + 474308.

It is an arithmetic number, because the mean of its divisors is an integer number (9959124).

Almost surely, 2^61651655 is an apocalyptic number.

61651655 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61651655 is a deficient number, since it is larger than the sum of its proper divisors (18021337).

61651655 is a wasteful number, since it uses less digits than its factorization.

61651655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948505.

The product of its digits is 27000, while the sum is 35.

The square root of 61651655 is about 7851.8567867734. The cubic root of 61651655 is about 395.0465255244.

The spelling of 61651655 in words is "sixty-one million, six hundred fifty-one thousand, six hundred fifty-five".