1225163661 has 8 divisors (see below), whose sum is σ = 1634173824. Its totient is φ = 816464640.

The previous prime is 1225163659. The next prime is 1225163689. The reversal of 1225163661 is 1663615221.

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

It is not a de Polignac number, because 1225163661 - 2¹ = 1225163659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225162661) 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, 68436 + ... + 84461.

It is an arithmetic number, because the mean of its divisors is an integer number (204271728).

Almost surely, 2^1225163661 is an apocalyptic number.

It is an amenable number.

1225163661 is a deficient number, since it is larger than the sum of its proper divisors (409010163).

1225163661 is a wasteful number, since it uses less digits than its factorization.

1225163661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155571.

The product of its digits is 12960, while the sum is 33.

The square root of 1225163661 is about 35002.3379362008. The cubic root of 1225163661 is about 1070.0351288435.

Adding to 1225163661 its reverse (1663615221), we get a palindrome (2888778882).

The spelling of 1225163661 in words is "one billion, two hundred twenty-five million, one hundred sixty-three thousand, six hundred sixty-one".