7551661 has 8 divisors (see below), whose sum is σ = 8188544. Its totient is φ = 6922800.

The previous prime is 7551653. The next prime is 7551671. The reversal of 7551661 is 1661557.

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 7551661 - 2³ = 7551653 is a prime.

7551661 is a modest number, since divided by 1661 gives 755 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7551671) 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, 40 + ... + 3886.

It is an arithmetic number, because the mean of its divisors is an integer number (1023568).

Almost surely, 2^7551661 is an apocalyptic number.

It is an amenable number.

7551661 is a deficient number, since it is larger than the sum of its proper divisors (636883).

7551661 is a wasteful number, since it uses less digits than its factorization.

7551661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4011.

The product of its digits is 6300, while the sum is 31.

The square root of 7551661 is about 2748.0285660815. The cubic root of 7551661 is about 196.1917895703.

The spelling of 7551661 in words is "seven million, five hundred fifty-one thousand, six hundred sixty-one".