75151661 has 8 divisors (see below), whose sum is σ = 81450264. Its totient is φ = 68927040.

The previous prime is 75151651. The next prime is 75151693. The reversal of 75151661 is 16615157.

It can be written as a sum of positive squares in 4 ways, for example, as 100 + 75151561 = 10^2 + 8669^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-75151661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75151621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16370 + ... + 20451.

It is an arithmetic number, because the mean of its divisors is an integer number (10181283).

Almost surely, 2^75151661 is an apocalyptic number.

It is an amenable number.

75151661 is a deficient number, since it is larger than the sum of its proper divisors (6298603).

75151661 is a wasteful number, since it uses less digits than its factorization.

75151661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36991.

The product of its digits is 6300, while the sum is 32.

The square root of 75151661 is about 8669.0057676760. The cubic root of 75151661 is about 422.0003986879. Note that the first 3 decimals are identical.

The spelling of 75151661 in words is "seventy-five million, one hundred fifty-one thousand, six hundred sixty-one".